

A233868


Numbers that are not the sum of two evil numbers.


0



1, 2, 4, 7, 31, 127, 511, 2047, 8191, 32767, 131071, 524287, 2097151, 8388607, 33554431, 134217727, 536870911, 2147483647, 8589934591, 34359738367, 137438953471, 549755813887, 2199023255551, 8796093022207, 35184372088831
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OFFSET

1,2


COMMENTS

Also, numbers that are not the sum of two distinct odious numbers.  David Radcliffe, Jul 21 2016


LINKS



FORMULA

a(n) = 5*a(n1)  4*a(n2) for n > 5.
G.f.: x*(12*x^4  5*x^3  2*x^2  3*x + 1)/((x  1)*(4*x  1)). (End)


CROSSREFS



KEYWORD

nonn,base,easy


AUTHOR



EXTENSIONS



STATUS

approved



